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| 1 | /* Atomic operations. PowerPC Common version. |
|---|---|
| 2 | Copyright (C) 2003-2024 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library; if not, see |
| 17 | <https://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | /* |
| 20 | * Never include sysdeps/powerpc/atomic-machine.h directly. |
| 21 | * Always use include/atomic.h which will include either |
| 22 | * sysdeps/powerpc/powerpc32/atomic-machine.h |
| 23 | * or |
| 24 | * sysdeps/powerpc/powerpc64/atomic-machine.h |
| 25 | * as appropriate and which in turn include this file. |
| 26 | */ |
| 27 | |
| 28 | /* |
| 29 | * Powerpc does not have byte and halfword forms of load and reserve and |
| 30 | * store conditional. So for powerpc we stub out the 8- and 16-bit forms. |
| 31 | */ |
| 32 | #define __arch_compare_and_exchange_bool_8_acq(mem, newval, oldval) \ |
| 33 | (abort (), 0) |
| 34 | |
| 35 | #define __arch_compare_and_exchange_bool_16_acq(mem, newval, oldval) \ |
| 36 | (abort (), 0) |
| 37 | |
| 38 | #define __ARCH_ACQ_INSTR "isync" |
| 39 | #ifndef __ARCH_REL_INSTR |
| 40 | # define __ARCH_REL_INSTR "sync" |
| 41 | #endif |
| 42 | |
| 43 | #ifndef MUTEX_HINT_ACQ |
| 44 | # define MUTEX_HINT_ACQ |
| 45 | #endif |
| 46 | #ifndef MUTEX_HINT_REL |
| 47 | # define MUTEX_HINT_REL |
| 48 | #endif |
| 49 | |
| 50 | #define atomic_full_barrier() __asm ("sync" ::: "memory") |
| 51 | |
| 52 | #define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \ |
| 53 | ({ \ |
| 54 | __typeof (*(mem)) __tmp; \ |
| 55 | __typeof (mem) __memp = (mem); \ |
| 56 | __asm __volatile ( \ |
| 57 | "1: lwarx %0,0,%1" MUTEX_HINT_ACQ "\n" \ |
| 58 | " cmpw %0,%2\n" \ |
| 59 | " bne 2f\n" \ |
| 60 | " stwcx. %3,0,%1\n" \ |
| 61 | " bne- 1b\n" \ |
| 62 | "2: " __ARCH_ACQ_INSTR \ |
| 63 | : "=&r" (__tmp) \ |
| 64 | : "b" (__memp), "r" (oldval), "r" (newval) \ |
| 65 | : "cr0", "memory"); \ |
| 66 | __tmp; \ |
| 67 | }) |
| 68 | |
| 69 | #define __arch_compare_and_exchange_val_32_rel(mem, newval, oldval) \ |
| 70 | ({ \ |
| 71 | __typeof (*(mem)) __tmp; \ |
| 72 | __typeof (mem) __memp = (mem); \ |
| 73 | __asm __volatile (__ARCH_REL_INSTR "\n" \ |
| 74 | "1: lwarx %0,0,%1" MUTEX_HINT_REL "\n" \ |
| 75 | " cmpw %0,%2\n" \ |
| 76 | " bne 2f\n" \ |
| 77 | " stwcx. %3,0,%1\n" \ |
| 78 | " bne- 1b\n" \ |
| 79 | "2: " \ |
| 80 | : "=&r" (__tmp) \ |
| 81 | : "b" (__memp), "r" (oldval), "r" (newval) \ |
| 82 | : "cr0", "memory"); \ |
| 83 | __tmp; \ |
| 84 | }) |
| 85 | |
| 86 | #define __arch_atomic_exchange_32_acq(mem, value) \ |
| 87 | ({ \ |
| 88 | __typeof (*mem) __val; \ |
| 89 | __asm __volatile ( \ |
| 90 | "1: lwarx %0,0,%2" MUTEX_HINT_ACQ "\n" \ |
| 91 | " stwcx. %3,0,%2\n" \ |
| 92 | " bne- 1b\n" \ |
| 93 | " " __ARCH_ACQ_INSTR \ |
| 94 | : "=&r" (__val), "=m" (*mem) \ |
| 95 | : "b" (mem), "r" (value), "m" (*mem) \ |
| 96 | : "cr0", "memory"); \ |
| 97 | __val; \ |
| 98 | }) |
| 99 | |
| 100 | #define __arch_atomic_exchange_32_rel(mem, value) \ |
| 101 | ({ \ |
| 102 | __typeof (*mem) __val; \ |
| 103 | __asm __volatile (__ARCH_REL_INSTR "\n" \ |
| 104 | "1: lwarx %0,0,%2" MUTEX_HINT_REL "\n" \ |
| 105 | " stwcx. %3,0,%2\n" \ |
| 106 | " bne- 1b" \ |
| 107 | : "=&r" (__val), "=m" (*mem) \ |
| 108 | : "b" (mem), "r" (value), "m" (*mem) \ |
| 109 | : "cr0", "memory"); \ |
| 110 | __val; \ |
| 111 | }) |
| 112 | |
| 113 | #define __arch_atomic_exchange_and_add_32(mem, value) \ |
| 114 | ({ \ |
| 115 | __typeof (*mem) __val, __tmp; \ |
| 116 | __asm __volatile ("1: lwarx %0,0,%3\n" \ |
| 117 | " add %1,%0,%4\n" \ |
| 118 | " stwcx. %1,0,%3\n" \ |
| 119 | " bne- 1b" \ |
| 120 | : "=&b" (__val), "=&r" (__tmp), "=m" (*mem) \ |
| 121 | : "b" (mem), "r" (value), "m" (*mem) \ |
| 122 | : "cr0", "memory"); \ |
| 123 | __val; \ |
| 124 | }) |
| 125 | |
| 126 | #define __arch_atomic_exchange_and_add_32_acq(mem, value) \ |
| 127 | ({ \ |
| 128 | __typeof (*mem) __val, __tmp; \ |
| 129 | __asm __volatile ("1: lwarx %0,0,%3" MUTEX_HINT_ACQ "\n" \ |
| 130 | " add %1,%0,%4\n" \ |
| 131 | " stwcx. %1,0,%3\n" \ |
| 132 | " bne- 1b\n" \ |
| 133 | __ARCH_ACQ_INSTR \ |
| 134 | : "=&b" (__val), "=&r" (__tmp), "=m" (*mem) \ |
| 135 | : "b" (mem), "r" (value), "m" (*mem) \ |
| 136 | : "cr0", "memory"); \ |
| 137 | __val; \ |
| 138 | }) |
| 139 | |
| 140 | #define __arch_atomic_exchange_and_add_32_rel(mem, value) \ |
| 141 | ({ \ |
| 142 | __typeof (*mem) __val, __tmp; \ |
| 143 | __asm __volatile (__ARCH_REL_INSTR "\n" \ |
| 144 | "1: lwarx %0,0,%3" MUTEX_HINT_REL "\n" \ |
| 145 | " add %1,%0,%4\n" \ |
| 146 | " stwcx. %1,0,%3\n" \ |
| 147 | " bne- 1b" \ |
| 148 | : "=&b" (__val), "=&r" (__tmp), "=m" (*mem) \ |
| 149 | : "b" (mem), "r" (value), "m" (*mem) \ |
| 150 | : "cr0", "memory"); \ |
| 151 | __val; \ |
| 152 | }) |
| 153 | |
| 154 | #define __arch_atomic_increment_val_32(mem) \ |
| 155 | ({ \ |
| 156 | __typeof (*(mem)) __val; \ |
| 157 | __asm __volatile ("1: lwarx %0,0,%2\n" \ |
| 158 | " addi %0,%0,1\n" \ |
| 159 | " stwcx. %0,0,%2\n" \ |
| 160 | " bne- 1b" \ |
| 161 | : "=&b" (__val), "=m" (*mem) \ |
| 162 | : "b" (mem), "m" (*mem) \ |
| 163 | : "cr0", "memory"); \ |
| 164 | __val; \ |
| 165 | }) |
| 166 | |
| 167 | #define __arch_atomic_decrement_val_32(mem) \ |
| 168 | ({ \ |
| 169 | __typeof (*(mem)) __val; \ |
| 170 | __asm __volatile ("1: lwarx %0,0,%2\n" \ |
| 171 | " subi %0,%0,1\n" \ |
| 172 | " stwcx. %0,0,%2\n" \ |
| 173 | " bne- 1b" \ |
| 174 | : "=&b" (__val), "=m" (*mem) \ |
| 175 | : "b" (mem), "m" (*mem) \ |
| 176 | : "cr0", "memory"); \ |
| 177 | __val; \ |
| 178 | }) |
| 179 | |
| 180 | #define __arch_atomic_decrement_if_positive_32(mem) \ |
| 181 | ({ int __val, __tmp; \ |
| 182 | __asm __volatile ("1: lwarx %0,0,%3\n" \ |
| 183 | " cmpwi 0,%0,0\n" \ |
| 184 | " addi %1,%0,-1\n" \ |
| 185 | " ble 2f\n" \ |
| 186 | " stwcx. %1,0,%3\n" \ |
| 187 | " bne- 1b\n" \ |
| 188 | "2: " __ARCH_ACQ_INSTR \ |
| 189 | : "=&b" (__val), "=&r" (__tmp), "=m" (*mem) \ |
| 190 | : "b" (mem), "m" (*mem) \ |
| 191 | : "cr0", "memory"); \ |
| 192 | __val; \ |
| 193 | }) |
| 194 | |
| 195 | #define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \ |
| 196 | ({ \ |
| 197 | __typeof (*(mem)) __result; \ |
| 198 | if (sizeof (*mem) == 4) \ |
| 199 | __result = __arch_compare_and_exchange_val_32_acq(mem, newval, oldval); \ |
| 200 | else if (sizeof (*mem) == 8) \ |
| 201 | __result = __arch_compare_and_exchange_val_64_acq(mem, newval, oldval); \ |
| 202 | else \ |
| 203 | abort (); \ |
| 204 | __result; \ |
| 205 | }) |
| 206 | |
| 207 | #define atomic_compare_and_exchange_val_rel(mem, newval, oldval) \ |
| 208 | ({ \ |
| 209 | __typeof (*(mem)) __result; \ |
| 210 | if (sizeof (*mem) == 4) \ |
| 211 | __result = __arch_compare_and_exchange_val_32_rel(mem, newval, oldval); \ |
| 212 | else if (sizeof (*mem) == 8) \ |
| 213 | __result = __arch_compare_and_exchange_val_64_rel(mem, newval, oldval); \ |
| 214 | else \ |
| 215 | abort (); \ |
| 216 | __result; \ |
| 217 | }) |
| 218 | |
| 219 | #define atomic_exchange_acq(mem, value) \ |
| 220 | ({ \ |
| 221 | __typeof (*(mem)) __result; \ |
| 222 | if (sizeof (*mem) == 4) \ |
| 223 | __result = __arch_atomic_exchange_32_acq (mem, value); \ |
| 224 | else if (sizeof (*mem) == 8) \ |
| 225 | __result = __arch_atomic_exchange_64_acq (mem, value); \ |
| 226 | else \ |
| 227 | abort (); \ |
| 228 | __result; \ |
| 229 | }) |
| 230 | |
| 231 | #define atomic_exchange_rel(mem, value) \ |
| 232 | ({ \ |
| 233 | __typeof (*(mem)) __result; \ |
| 234 | if (sizeof (*mem) == 4) \ |
| 235 | __result = __arch_atomic_exchange_32_rel (mem, value); \ |
| 236 | else if (sizeof (*mem) == 8) \ |
| 237 | __result = __arch_atomic_exchange_64_rel (mem, value); \ |
| 238 | else \ |
| 239 | abort (); \ |
| 240 | __result; \ |
| 241 | }) |
| 242 | |
| 243 | #define atomic_exchange_and_add(mem, value) \ |
| 244 | ({ \ |
| 245 | __typeof (*(mem)) __result; \ |
| 246 | if (sizeof (*mem) == 4) \ |
| 247 | __result = __arch_atomic_exchange_and_add_32 (mem, value); \ |
| 248 | else if (sizeof (*mem) == 8) \ |
| 249 | __result = __arch_atomic_exchange_and_add_64 (mem, value); \ |
| 250 | else \ |
| 251 | abort (); \ |
| 252 | __result; \ |
| 253 | }) |
| 254 | #define atomic_exchange_and_add_acq(mem, value) \ |
| 255 | ({ \ |
| 256 | __typeof (*(mem)) __result; \ |
| 257 | if (sizeof (*mem) == 4) \ |
| 258 | __result = __arch_atomic_exchange_and_add_32_acq (mem, value); \ |
| 259 | else if (sizeof (*mem) == 8) \ |
| 260 | __result = __arch_atomic_exchange_and_add_64_acq (mem, value); \ |
| 261 | else \ |
| 262 | abort (); \ |
| 263 | __result; \ |
| 264 | }) |
| 265 | #define atomic_exchange_and_add_rel(mem, value) \ |
| 266 | ({ \ |
| 267 | __typeof (*(mem)) __result; \ |
| 268 | if (sizeof (*mem) == 4) \ |
| 269 | __result = __arch_atomic_exchange_and_add_32_rel (mem, value); \ |
| 270 | else if (sizeof (*mem) == 8) \ |
| 271 | __result = __arch_atomic_exchange_and_add_64_rel (mem, value); \ |
| 272 | else \ |
| 273 | abort (); \ |
| 274 | __result; \ |
| 275 | }) |
| 276 | |
| 277 | #define atomic_increment_val(mem) \ |
| 278 | ({ \ |
| 279 | __typeof (*(mem)) __result; \ |
| 280 | if (sizeof (*(mem)) == 4) \ |
| 281 | __result = __arch_atomic_increment_val_32 (mem); \ |
| 282 | else if (sizeof (*(mem)) == 8) \ |
| 283 | __result = __arch_atomic_increment_val_64 (mem); \ |
| 284 | else \ |
| 285 | abort (); \ |
| 286 | __result; \ |
| 287 | }) |
| 288 | |
| 289 | #define atomic_increment(mem) ({ atomic_increment_val (mem); (void) 0; }) |
| 290 | |
| 291 | #define atomic_decrement_val(mem) \ |
| 292 | ({ \ |
| 293 | __typeof (*(mem)) __result; \ |
| 294 | if (sizeof (*(mem)) == 4) \ |
| 295 | __result = __arch_atomic_decrement_val_32 (mem); \ |
| 296 | else if (sizeof (*(mem)) == 8) \ |
| 297 | __result = __arch_atomic_decrement_val_64 (mem); \ |
| 298 | else \ |
| 299 | abort (); \ |
| 300 | __result; \ |
| 301 | }) |
| 302 | |
| 303 | #define atomic_decrement(mem) ({ atomic_decrement_val (mem); (void) 0; }) |
| 304 | |
| 305 | |
| 306 | /* Decrement *MEM if it is > 0, and return the old value. */ |
| 307 | #define atomic_decrement_if_positive(mem) \ |
| 308 | ({ __typeof (*(mem)) __result; \ |
| 309 | if (sizeof (*mem) == 4) \ |
| 310 | __result = __arch_atomic_decrement_if_positive_32 (mem); \ |
| 311 | else if (sizeof (*mem) == 8) \ |
| 312 | __result = __arch_atomic_decrement_if_positive_64 (mem); \ |
| 313 | else \ |
| 314 | abort (); \ |
| 315 | __result; \ |
| 316 | }) |
| 317 |
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